Sanyo DP42848 ccfl info

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  • Technician.Austin
    New Member
    • Jan 2016
    • 4
    • USA
    #1

    Sanyo DP42848 ccfl info

    Hello all, and first off thank you for all that you do here!

    I'm working with a sanyo DP2848 tv, went through the 2 seconds to black info.

    Dismantled TV, found one CCFL black, cracked and clearly blown. One more bulb on same triplet with a dark spot.

    I am wondering if a failed CCFL will cause the 2 seconds to black alone, and if i remove the bad bulb(s) if the tv will function without. Or what I will need to do to bypass error detection.

    If the tv will not funtion minus one or two ccfl's. then does anyone here have an accurate measurment for a replacement ccfl from ccflwarehouse ?
    I can provide pictures if needed, and I'm also ready to do DVOM meter testing.


    Thank you all again!
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: Sanyo DP42848 ccfl info

      All the lamps have to be good, it will only take one bad lamp for the protection circuit to kick in.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

      Voltage Regulator (LDO) testing:
      http://www.badcaps.net/forum/showthr...999#post300999

      Inverter testing using old CFL:
      http://www.badcaps.net/forum/showthr...er+testing+cfl

      Tear down pictures : Hit the ">" Show Albums and stories" on the left side
      http://s807.photobucket.com/user/budm/library/

      TV Factory reset codes listing:
      http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • Technician.Austin
          New Member
          • Jan 2016
          • 4
          • USA
          #3
          Re: Sanyo DP42848 ccfl info

          Do all of the CCFLs have to be installed for the system to work?

          After removing the faulty CCFLs, i was able to keep the backlight on, I decided to reassemble the LCD but after installing the screen I'm back to the 2 sec to black.

          Also, If I only run the top 4 CCFLs, they will stay on. As soon as I attach a 5th ccfl, it goes back to 2 sec to black. It doesn't matter which CCFL is the 5th. And any 4 will stay lit at one time.
          Last edited by Technician.Austin; 01-04-2016, 10:57 PM. Reason: added info

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA
              #4
              Re: Sanyo DP42848 ccfl info

              Originally posted by Technician.Austin
              Do all of the CCFLs have to be installed for the system to work?

              After removing the faulty CCFLs, i was able to keep the backlight on, I decided to reassemble the LCD but after installing the screen I'm back to the 2 sec to black.
              Yes, all the lamps have to be good.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA
                  #5
                  Re: Sanyo DP42848 ccfl info

                  Do you have the pictures of the boards, and the lamps to show us how all the lamps are driven?
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                    Comment

                    • Technician.Austin
                      New Member
                      • Jan 2016
                      • 4
                      • USA
                      #6
                      Re: Sanyo DP42848 ccfl info

                      This is the best I can do tonight. Can get better HD shots tomorrow.

                      http://imgur.com/a/yu5Ro

                      note: there is no burning of the pcb, and no visible damage to any of the chipware. The power supply board is less than a year old as well as the key controller.
                      Last edited by Technician.Austin; 01-04-2016, 11:24 PM.

                        Comment

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